Neco Model Questions Vol1 2021 Physics Question 7

Practice objective / multiple choice question 7 from the 2021 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2021 Physics Objective / Multiple Choice Medium Difficulty
Question 7 NECO_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A \(10\ \text{kg}\) crate is pulled across a horizontal floor by a constant force of \(80\ \text{N}\) applied at \(30^{\circ}\) above the horizontal. The coefficient of kinetic friction between the crate and the floor is \(0.20\). The crate starts from rest and moves \(5.0\ \text{m}\) in \(4.0\ \text{s}\). (i) Calculate the work done by the pulling force. (ii) Determine the work done against friction. (iii) Find the increase in the crate's kinetic energy. (iv) Compute the average power delivered by the pulling force during the motion.

Answer Options

Correct Answer A. Work by pull = 3.46×10^2 J; work against friction = -5.8×10^1 J; ΔK = 2.88×10^2 J; average power = 7.2×10^1 W
B. Work by pull = 3.80×10^2 J; work against friction = -4.8×10^1 J; ΔK = 3.30×10^2 J; average power = 8.0×10^1 W
C. Work by pull = 3.20×10^2 J; work against friction = -6.5×10^1 J; ΔK = 2.55×10^2 J; average power = 6.5×10^1 W
D. Work by pull = 2.90×10^2 J; work against friction = -7.2×10^1 J; ΔK = 2.20×10^2 J; average power = 5.5×10^1 W
Correct Answer
A
Correct Option:
Work by pull = 3.46×10^2 J; work against friction = -5.8×10^1 J; ΔK = 2.88×10^2 J; average power = 7.2×10^1 W

About This Question

This is Neco Model Questions Vol1 2021 Physics Question 7. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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